Why is FDNB sometimes referred to as Sanger's reagent?

• A. Frederick Sanger used FDNB to sequence DNA.
• B. Frederick Sanger used FDNB to label C-terminal amino acids.
• C. Frederick Sanger first used FDNB to identify N-terminal amino acids in proteins.
• D. Frederick Sanger discovered FDNB as a new chemical compound.

Answer: (C)